AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Teredo navalis [WoRMS] | |
Authority | Linnaeus, 1758 | |
Family | Teredinidae | |
Order | Myida | |
Class | Bivalvia | |
Phylum | Mollusca | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Not entered Comments: N Pacific Australasia and North Atlantic |
Life form / Life stage (?) |
Comments: Teredo navalis, the naval shipworm, is a species of saltwater clam. Teredo navalis takes about five weeks to develop from eggs to metamorphosing larvae. They spend half of this time in the mother’s gill chamber until they are released into the water as free-swimming larvae. |
Sociability / Life stage (?) |
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Reproductive frequency (?) | Iteroparous References (not structured): Grave B H (1928) Natural history of shipworm, Teredo navalis, at Woods Hole, Massachusetts. Biological Bulletin, Volume 55:4 Comments: Up to 5 million larvae are developed per cycle. The larval phase is 11–35 days, usually 28 day. Larvae disperse with water current. |
Reproductive type (?) | Asexual Self-fertilization References: Grave B H (1928) Natural history of shipworm, Teredo navalis, at Woods Hole, Massachusetts. Biological Bulletin, Volume 55:4 Comments: It is a protandric hermaphrodite. During metamorphosis male gametes develop after six weeks. They can also self-fertilise. After reproduction it changes back to the male phase and another cycle is started. Fertilisation is internal and female carries the young embryos in the gill chamber |
Developmental trait (?) | Parental care Spawning Comments: Males release sperm into the water, which females pick up via the incurrent siphon. This occurs on multiple occasions, as females spawn 3 to 4 times per season. Females carry offspring in gill chambers during early development. When larvae reach the advanced veliger stage, they are released into the water. |
Characteristic feeding method / Life stage (?) |
References (not structured): Grave B H (1928) Natural history of shipworm, Teredo navalis, at Woods Hole, Massachusetts. Biological Bulletin, Volume 55:4 Comments: Planktonic larvae are consumed by filter feeders. Adults are only vulnerable to predators once the wood they colonise collapses. Naval shipworms primarily feed on wood. They are able to do so because of enzymes produced by the nitrogen-fixing bacteria within them. Teredo navalis use their shell to cut into the wood. The pieces are then transported into the mouth via cilia. Organisms from the water may also be taken up for food via the inhalant siphon. Free-swimming veligers feed on plankton. |
Mobility / Life stage (?) |
References (not structured): Grave B H (1928) Natural history of shipworm, Teredo navalis, at Woods Hole, Massachusetts. Biological Bulletin, Volume 55:4 Comments: Shipworm burrows in an exposed timber occur within two or three feet of the mud line as a mean of protection. |
Salinity tolerance range (?) | Venice system: 5. α-Mesohaline [10-18psu] 6. Polymixohaline [18-30psu] 7. Euhaline [30-40psu] References: Paavola M, Olenin S, Leppäkoski E (2005) Are invasive species most successful in habitats of low native species richness across European brackish water seas? Estuarine, Coastal and Shelf Science 64(4), 738-750 References: Olenin S, Leppakoski E, Gollasch S, Gruszka P, Skora K, Hoppe K, Ojaveer H, Orlova M (2002) Recently introduced non-indigenous species. Environment of the Baltic Sea area, 1994-1998. HELCOM. Baltic Sea Environment Proceedings, 82B: 173-175 |
Habitat modifying ability potential (?) | Allogenic ecosystem engineers References: Imai, T., Hatanaka, M., Sato, R. 1951. Breeding of marine timber-borer, Teredo navalis L., in tanks and its use for anti-boring test (Doctoral dissertation, Tohoku University). |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Unknown Comments: Not available. |
Known human health impact? | Known Comments: Harmless. |
Known economic impact? | Known References: Grave, B. H. 1928. Natural history of shipworm, Teredo navalis, at Woods Hole, Massachusetts. The Biological Bulletin, 55(4), pp. 260-282. Comments: Naval shipworms have many negative effects due to their wood boring activity. They have been noted to cause damage in ships and dikes. Weakening of dike gates, combined with a heavy storm, resulted in flooding of the Netherlands in 1731. Teredo navalis also eat away at piers and wharfs. In San Francisco Bay, they can cause 200 million dollars worth of damage yearly. |
Known measurable environmental impact? | Known References: Grave, B. H. 1928. Natural history of shipworm, Teredo navalis, at Woods Hole, Massachusetts. The Biological Bulletin, 55(4), pp. 260-282. Comments: Naval shipworms break down submerged wooden substrates. The holes they create in the wood can be used by crustaceans such as Idotea. Teredo navalis share a symbiotic relationship with the nitrogen-fixing bacteria within them that help the shipworms digest wood. Some protozoa are known to parasitize this species. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF] Available at: https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf [Accessed 1 July 2024]. |
Association with vessel vectors (?) | Ballast waters References: Gollasch S, Macdonald E, Belson S, Botnen H, Christensen JT, Hamer JP, Houvenaghel G, Jelmert A, Lucas I, Masson D, McCollin T, Olenin S, Persson A, Wallentinus I, Wetsteyn LPMJ, Wittling T (2002) Life in Ballast Tanks In: Invasive aquatic species of Europe - distribution, impact and management. Leppäkoski, E, Gollasch S, Olenin S(eds). Kluwer Academic Publishers: 217-231 |
Last update by | Sandra Gečaitė, 2024-08-21 |